RFR: 8079786: [macosx] Test java/awt/Frame/DisposeParentGC/DisposeParentGC.java fails for Mac only

[Prasanta Sadhukhan]

Test is now passing in mac..Several iterations of the test passed in CI system..link in JBS...deproblemlisted...

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Commit messages:
 - 8079786: [macosx] Test java/awt/Frame/DisposeParentGC/DisposeParentGC.java fails for Mac only

Changes: https://git.openjdk.org/jdk/pull/18449/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18449&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8079786
  Stats: 21 lines in 2 files changed: 18 ins; 1 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/18449.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18449/head:pull/18449

PR: https://git.openjdk.org/jdk/pull/18449